Throttling device for pneumatic tools or the like.



G. H. GILMAN. DEVICE-FOR PNEUMATIG TOOLS'OR THE LIKE.

THROTTLING APPLICATION ILED FEB. 2,'1907.

Patented Feb. 14, 1911.

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`UNITED sTATEs PATENT oEEIoE.

GEORGE H. GILMAN, OF CLAREMONT, NEINl HAMPSHIRE, .ASSIGNOLB/` TOSULLIVAN MACHINERY COMPANY, OE CLABEMONT. NEW HAMPSHIRE, A CORPORATION0F MAINE.

Specification of Letters Patent.

Patented Feb. 14, 1911.

Application filed February 2, '1907. Serial No. 355,493.

'loaZZ whom-fit mcwoncera:

Be it known that-I, GEORGE a citizen of the United States, residin atClaremont, in the county of Sullivan, tate of New Hampshire, haveinvented an Improvement in Throttling Devices for Pneu) matic Tools orthe Like, of which the fol\ lowing description, in connection With theaccompanying drawings, is a specication, like letters on the drawingsrepresenting like parts.

My invention relates to throttling devices, being more particularlyconcerned with the throttle control of the tool operated by com pressedair or other pressure fluid, and particularly Where such tools are fedtoward or H. GrcMAN,

held to the Work by means Vof a pressure actuated feeding device.

'ftaken inconnect-ion withthe accompanying illustration of one Vspecificembodiment thereof while its scope will be more particularly pointedoutin the appended claims.

In the drawingsz--Figure 1 represents in fragmentary sectional centralelevation a tool appliance to which is applied one, form of myinvention; Fig. 2 represents inside 'elevation ona smaller scale thetoolappli- ,ance shown in Fig. l; Figs, 4 and 5 show a reproduction of afragmentary portion of the sectional view in Fig. 1, the throttle valve,however, being shown in diderent posil-ions. Fig. 6. is a section on theline 6-6 mer drlll of ordinary end usual construc- The details of thedrill are not shown, it being suiicient to say that in the ap aratusdescribed the cutting tool 2 is he d in a suitablechuck at the end ofthedrill tool reoccurring blows by a reciprocatory iston (not shown withinthedrill tool cylinder,

is well understood by those shown pressure iui feeding means lforholding the cutting .toolu against its work,-

. of a cylinder 3 having one end iiXedly attached to the head block 4 ofthe drill tool and the opposite end provided with apacked aperturethrough-which projects the piston ro'd 5, carrying at its end thepointed foot 6 adapted to be braced against a Vertical side wall of amine or quarry, in which the apparatus is used.' Vithin the cylinder thepiston rod is secured to the'piston 7, so that when air is admitted tothe cylinder between the piston and the forward cylinder head or thatnext adjacent the drilltool, the cylinder with its attached head ispressed for* wardly in much the same fashion as Vif the hammer drillwere pressed forward against the work by the hand of the operator.

For controlling the admission of pressure fluidl not only to the feedingcylinder but also to the-tool itself, there is provided a rotatablesleeve 8 which is mounted upon a reduced'portion 9 of the drill toolhead 4. Into the end of the reduced head portion 9 is threadedthe end'of the feedingcylinder 3, so that the latter and the cylinder headblock 10, which closes the end of the cylinder, are seated against andxedly held by the walls the drill head;

To retain. the sleeve 8 longitudinally in position there is proyided thesplit clamping collar 1I, which 1s clamped about `the necked-d`own endAof the reduced head portion 9. In order'that this clamp'may' also assistin securing the cylinder end more firmly, the interiorly threadednecked-down mort-ion of the head 4portion is preferably provided withtwo or more longitudinal slits (not shown) so that when the clampf ingcollarlis set u tight it also clamps the head and the cylinder into Iirmthreaded engagement with Veach other.

Arranged transversely Within the reduced portion of the -drill head isprovided the throttle valve 12,'hereinshown of the piston type, workingin a cylindrica1pbcket 'or recess 13 and controlled by rotative movementof the sleeve 8. This valve is provided with an inner head 14, an outerhead 15V and a.

reduced connecting portion. The outer head 15 contacts with the'seat(1r/bottom Vof an annular groove or recess, such groove or recess,however, being eccentrically formed (sec Fig. G) in the sleeve so as toprovide at its bottom face a cam Vsurface which engages the outerprojecting head of the valve." Pressure fluid is supplied jointly from yany suitable souice not shown) to the feeding cylinder and the tool bythe pipe 17, which latter has a threaded nipple connected to theadmission opening 18 at the side of the cylinder near its att-achment tothe drill tool. Communicating with the admission opening 18 is the mainsupply port 19, which extends longitudinally forward through thecylinder headblock 10 and the tool head block to the valve pocket 13,access of the pressure fluid from this port to the valve pocket beingcontrolled by the inner head 14 of the valve, which 1nay be moved toopen' the exit wholly or partially or to completely close the same.Opening out of the valve pocket are two passages 20 and 21, the formerbeing arranged parallel with the admission port 19 and leading back tothe pressure space 22 within the feeding cylinder. Thel second andshorter passage A2l leads from the valve pocket in the oppositedirection to the pressure space 23 of the drill tool, whence pressure.is supplied to the tool cylinder through the control of a suitablediderential or other' valve (not shown) of any usual -or suitableconstruction. l

To cause the valve to seat normallyr out against the bottom of theeccentric sleeve groove there is provided means for maintainingconst-ant pressure upon the inner end ofthe valveY While this might beeffected by mechanical means, such as a spring, for simplicity andgreater effectiveness I provide a pressure duct 24 connecting thepressure fiuidsupply port 19 and the enlarged bottom 25 of the valvepocket. Pressure iiui acting against theenlarged inner head of the valvepresses it constantly Ioutward 'against the cam surface -of\ the sleevegroove.

When the apparatus is in disuse the sleeve vTis turned to a positionwhich places the .valve as shown in Fig. 1. lUnder these conditions thecylinder passage 20 is uncovered and placed in communication with theupper part of the valve pocket. The outer end of the valve pocket isprovided with a notch or recess y26 and this connects the upper end ofthe valve pocket with the eccentric groove or recess, which is madesomewhat Wider than the diameter of the valve head 15 and is also ventedthrough one or more apertures 27 leading to the eX- terior', so thatwith the valve as shown in Fig. v1 lthe cylinder space 22 is connecteddirectly to the atmosphere and the pressure4 fluid is exhausted. Underthese conditions also, the inner' valve head 14 closes the passages 19'and. 21 cutting oit the-supply of pressjure fluid to the drill tool. Ifthe sleeve is then turned from the position shown in Figs. 1 and G, theincreasing shallowness of. the cam groove forces the valve inwardly.This rst closes thejeXhaustfrom the feeding cylinder by covering thenotch 26 with -t-he oiter head of the throttle valve and then causes theuncovering of the admission port 19, so thatthe latter is placed incommunication with the cylinder port 20, admitting feeding pressure tothe cylinder space 22. The valve is then in some such position as shownin Fig. 3, the drill port 21 still. being closed. With the drill toolpressed against the work by the pressure fluid in' the feeding cylinder,if the sleeve isaturned stilll farther inthe-same direction the valvewill be forced to'some such position as shown in Fig. '-1 where arestricted admission of pressure fluid takes place to the drill toolthrough the'port Further movement of the sleeve forces the valve towardthe position shown in Fig. 5, where full admission to the drill tooltakes place, the pres-` surefluid, as before freely entering the.cylinder port 20 to keep the tool pressed against 'there is provided asingle controlling device which 'acts to control both the feedingpressure Huid and the toolV pressure fluid, this being accomplished inthe present instance by successive steps, so'that before -the toolpressure fluid is applied feeding pressure fluid for holding ,the toolagainst, the work In order that the sleeve may have a delie nite rangeof movement and be turned with certainty from a fixed initial positionto a definite final position there is provided a' fixed stop pin 28projecting longitudinally and rearwardly from the enlarged portion 4f ofthe drill head and working (see Fig. 7) within a segmental groove orrecess ,29 in the side of the sleeve. When the sleeve is turned to onelimit of itsmovement, corresponding to the valve position in Fig. 1

the pin is caused lto abut against one end the'groove and when turned tothe opposite limit of movement and in the direction of the arrow in Fig.7, corresponding to position shown in Fig.- 5, the pin is caused to abutagainst theopposite end of the Groove.

, In order to assist -the retention of the sleeve in bothl the extremeand intermediate positions assigned, and to' assist the operator infinding, by the sensation of touch alone,

those' intermediate positions which practice may show are the moreoftenrequired, I have" provided a positioning device for the sleeve,comprising a pin 30 seated in a long-. gitudinal pocket in the sleeve,-and having its beveled head pressed outwardly by the spring 31, so as toseat in any one of a series ido of depressions formed inthe opposingface of the head block, the latter being brought into successivealinenient with the pin as the lthe grasp of the operators hand.

While the' piston may be ot any desired construction, in order to betterprevent lealtage troni the pressure cylinder, the piston, i'n theapparatus shown, has a reduced end 32 (Fig. l.) on` which there isprovided a sleeve 33.4 The inner endo said sleeve has formed thereon ashoulder adapted to re ceive a packing ring 34, which latter, theretore, rests between the shoulder and theen largedqportion of the piston7. Beyond the sleeve 33 there is also provided another shouldered sleevecarrying-a second packing ring 36. On an outer shoulder of the sleeve 35is arranged a split expanding ring 37 and this, together With the sleeve35, is retained in place hy the feed -pistonnut 38 secured to thethreaded end of the reduced piston por tion The reduced piston portionis pro vided with an axial passage 39 extending .being extended part Wayinto the same and opening into the space 22,- radial passages ll()alining withv the piston ring 234i aiidvother radial passages 41 alininwith the piston ring 36 rom the asia-l passage through the piston andthe respective sleeves,

so as to admit pressure fluid constantly to i `the inside of the pistonrings. therefore, as mitted to expand the rines and better to prevent'lealt- So long, feeding pressure tluid is adthepressure space, it alsoacts to age. A tapered plug 42 is threaded into the endfof said pistonand the latter is split at 43,- so that the plug expands the piston endWithin the threaded nut 38 and prevents any loosening of the parts.rlt`he plug is provided-With an axial passage 4A, which places thatpiston passage 39i1i communication. With the pressure space 22. Theinner end of the yfeedmg cylinder is enlarged slightly at llo,

Where its Walls engage the spring 37 in the contracted condition ot thepiston, so that the expansion of the ring tends to retain the pistonnormally in' that position,l rendering lit more, convenient for purposesof trans .porta/tion or handling. The enlarged portiono the cylinder,however, is beveled at i `4:6 andi theend of the rin is also rounded at47., vso that pressure fluid Whenadmitted will readily force .the pistonoutward by forcing the ring to Contact and ride over-'thc tions may bemade therein without departing from the spirit of my invention.

Claims." i

l. The combinationwith a pressure fluid tool of pressure duid feedingmeans there tor, a movable sleeve and means operated hy the movement ofsaid sleeve tor controlling the admission of pressure fluid to said tooland to said feeding means.

2. rllhe combination with a pressure tluid tool ol pressure fluidfeeding means there tor, a rotatable sleeve and means operated by therotated movement ot said sleeve, for controlling pressuremtluidadmission to said' tool and to said feeding nieans.`

3. The combination with a pressure fluid tool ot' pressurefluid feedingmeans alined therewith and sleeve controlled throttling means both, torthe tool and'lnthe feeding mean.; and located between the same.

4.. The combination `vvithsa pressure duid tool of pressure tl 'dfeeding means thereot parts shown, but that extensive'modilicaftor, afeeding cylint er having itshead end l for the reception of the valveand other parte, the said feeding cylinder having head, feeding pistonin said feed cylinder, a piston-rod connected -thereto and projectingthrough" the open opposite end of said cylinder, a throttle valve and asleeve for duced portion of said drill tool-head. q

6. The-combination with fluid pressure tool, of a feeding cylinderrigidly securedto ably mounted Withinsaidcylinder, a piston rodconnected thereto and projecting der, a valve `and-a valve controllingsleeve for controlling the pressure duid supply to sail feedingcylinder, said l'sleeve being mounted in tool. y

7. In an apparatus of the'class a described, pressure tluld tool havinga toolcylinder,

" nested at one end with the tool cylinder' and,

latter containing suitable passages or spaces a reduced portion ofsaidfdrill a feeding, cylinder, a drill tool-head conthreaded connectionwith said drill toolcont-rolling said valve mounted upon a re- Y.

the end of said'tool, a feeding piston slid.- l

through the opposite open end of said cylinf in@ the ,other with thefeeding cylinder', a sleeve encircling a reduced portion of the drilltool-head near the feeding cylinder and a valve transversely arranged insaid drill tool-head and controlling a pressure Huid passage leading tosaid feed cylinder, said valve being controlled by said encirclingsleeve. l 1

S.' The combination with a pressure lluid tool of pressure fluid feedingmeansr therefor, and a controlling device for said tool and said feedingmeans comprising a member having pressure fluid supply passages leading,respectively, to said tool and said feeding means, a sleeve mounted forturning movement on said member and a valve arranged transversely insaid member to control the pressure supply passage and adapted to beactuated by movement of the sleeve.

9. The combination with a pressure fluid tool of pressure fluid feedingmeans therefor, the same comprising a feeding cylinder and a relatively`movable feeding piston, the oneattached to the tool and the otheradapted to beheld by a suitable support, amovable sleeve, and meansoperated by the movement of said sleeve for controlling the admission ofpressure -uid to the tool .and to the feeding means. Y

10. The combination with a pressure fluid tool of pressure lluid feedingmeans 7dierefor,.the same comprising a feeding cylinder and a relativelymovable feedingqbpiston. one of which is attached to said tool andalined therewith, whereby the apparatus is given a column -lilreformation, a movable sleeve mounted upon said column-like formation. andmeans operated by the movement of said sleeve for controlling theadmission of pressure duid to the tool and 'to said'feeding means.

11. The combination with a pressure fluid tool of pressure lluid feedingmeans therefor, and a rotatable sleeve throttle for the tool and thefeeding means located between the tool and the feeding means.

12. The combination with a pressure fluid tool of pressure fluid feedingmeans therefor, a rotatable sleeve., means operatedl by movement of saidsleeve for controlling the admission of pressure fluid to the tool andto the feeding means, and positioning means for said sleeve.

13. The combination with a pressure fluid tool of pressure fluid feedingmeans therefor, fluid pressure supply passages leading to said tool andto said feeding means, a

vvalve controlling the same, a rotatable sleeve for operating said valveand positioning means for said .sleeve comprising a springpressed membercarried by said sleeve and adapted to engage with one or more depres-ysions in an adjacent-.zuperating member.

14. The combination with a pressure fluid tool of pressure fluidfeedingzmeans therefor, a rotatable sleeve, means controlled by.

the movement of said sleeve for admitting pressure fluid to said tooland to said feeding means, a fixed member adjacent the sleeve, aplurality of depressions in said fixed member', a pocket in said sleeve,and a spring-pressed pin in said pocket adapted' to engage withdepressions on rotation of said sleeve.

15. The combination with a pressure fluid tool of pressure fluid feedingmeans substantially alined'therewith, the same comprising a feedingcylinder and a. feeding piston, one of which is attached to the head ofsaid tool, suitable pressure fluid passages in the tool head, a throttlevalve also in said tool head controlling admission of pressure fluid tothe tool and to the feeding cylinder, and a sleeve for controlling saidthrottle valve movably mounted upon said tool head.

16. The combination with an apparatushaving a pressure fluid tool ofpressure fluid feeding means therefor, a valve for said tool and saidfeeding' means, and means for actuating said valve through theassistance of the pressurel duid.

17. An-apparatus of' the class described having' the pressure fluid tool1, t-he feeding cylinder 3, the feeding piston 7 the sleeve 8, thethrottle valve 14', and pressure fluid supply passages 19, 2O and 21controlled thereby. Y

18. In an air feed hammer drill, a head block, an air supply, an airfeed cylinder attached directly to the head block, a piston located in'the cylinder having its rod eX- te'nded rearwardly to form a rearsupport for `the tool, and a manually operated valve in the head blockfor controlling communication between the air supply, the air feedcylinder and the hammer.

19. In an air feed hammer drill, a head block, a hammer tool, an airsupply, an air feed cylinder attached to the head block, its pistonhaving a lpart extending Afrom the rear of said cylinder, and aymanuallyoperated valve in the head block having pas.- sages arranged when in oneposition to open communication between the air supply and the air feedcylinder and close communication between the air supply and hammerandwhen .in another position to open communication between the airsupply and the air feed cylinder and the hammer. 20. In an air feedhammer drill, a hea block, a'hammer tool, an air supply, an air feedcylinder attached to the head block, a piston having a. partextendingfrom the rear of said cylinder, and a manually oper ated valvein the head block having passages arranged when in its first position toopen communication between the air, feed cylinder and externalatmospherer and close u. communication ,between the air fsupply,y the.

' air feed cylinder and the hammer; when in its second position to closecommunication between the air feed cylinder and external atmosphere andbetween` the air supply and hammer' andv tol open communicatlon be tweenthe air supply and air feedcylinder;

munication between the air supply; the air feed cylinder and the hammer.

21. In an air feed hammer drill, a head block, a hammer tool connectedthereto, an

an supply, an nir feed cylinder attached to art ex-` the head block, apiston having a tending from the rear of said' cylin er,- and a manuallyoperated valve havlng passages arranged when in one position to open'com-4 munication between the `air supply and the air feed cylinder. andclose communication between the air supply and hammer land when inanother position to open communication between the air supply andthe airfeed cylinder and the hammer.

22. In an air feed hammer drill, the combinationwith alhammer tool, of afeed cylinder having a rigid connection to the tool, a feeding pistonwithin the cylinder, a fluid passage leadingy to the hammer tool, afluid passage leading to the cylinder for admit-v and when in its thirdposition to open comf tin? pressure fluid thereto, and a single manual yoperated valve controlling said passages andarranged when in oneposition to open communication between the air supply and theair feedcylinder and close comrnunication between the air supply and hammer, andwhen in another position lto open communicationbetwee'n the air supplyand 'the air feed cylinder and the hammer.-

In testimony whereof,A I have signed my name to this specification, inthe presence of two' subscribing witnesses.

GEORGEl H. GILMAN.

Witnesses:

L. WILLsoN HALL, E. J. Bonet-IARD.

